The greatest number of bits you could borrow from the host portion of a class b subnet mask and still have at least 130 host per subnet is 24.
What is a host bit?
Host bits are known to be the parts of an IP address that can state out a particular host in any subnet.
Note that whenever we take or borrow an host-bit, we can also double the number of subnets that we are said to create and as such, when we borrowing 2 host bits we can have 4 subnets.
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